[PATCH v1 kvmtool 1/7] arm/gicv2m: Set errno when gicv2_update_routing() fails

[Alexandru Elisei <alexandru.elisei@arm.com>]

In case of an error when updating the routing table entries,
irq__update_msix_route() uses perror to print an error message.
gicv2m_update_routing() doesn't set errno, and instead returns the value
that errno should have had, which can lead to failure messages like this:

KVM_SET_GSI_ROUTING: Success

Set errno in gicv2m_update_routing() to avoid such messages in the future.

Signed-off-by: Alexandru Elisei <alexandru.elisei@arm.com>
---
 arm/gicv2m.c | 10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

diff --git a/arm/gicv2m.c b/arm/gicv2m.c
index d7e6398..b47ada8 100644
--- a/arm/gicv2m.c
+++ b/arm/gicv2m.c
@@ -42,16 +42,18 @@ static int gicv2m_update_routing(struct kvm *kvm,
 {
 	int spi;
 
-	if (entry->type != KVM_IRQ_ROUTING_MSI)
-		return -EINVAL;
+	if (entry->type != KVM_IRQ_ROUTING_MSI) {
+		errno = EINVAL;
+		return -errno;
+	}
 
 	if (!entry->u.msi.address_hi && !entry->u.msi.address_lo)
 		return 0;
 
 	spi = entry->u.msi.data & GICV2M_SPI_MASK;
 	if (spi < v2m.first_spi || spi >= v2m.first_spi + v2m.num_spis) {
-		pr_err("invalid SPI number %d", spi);
-		return -EINVAL;
+		errno = EINVAL;
+		return -errno;
 	}
 
 	v2m.spis[spi - v2m.first_spi] = entry->gsi;
-- 
2.20.1